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DERIVATIVES AND HEDGING ACTIVITIES (Tables) | 6 Months Ended
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Jun. 30, 2022
Derivatives, Fair Value [Line Items] |
Effect of Cash Flow Hedge Accounting on Accumulated Other Comprehensive Income (Loss) | The table below presents the effect of the cash flow hedge accounting on accumulated other comprehensive income (loss) for the periods indicated:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 30, | ​ | June 30,
(In thousands) |  | 2022 |  | 2021 | ​ | 2022 |  | 2021
Gain (loss) recognized in other comprehensive income | ​ | $ | 2,309 | ​ | $ | (1,406) | ​ | $ | 9,161 | ​ | $ | 3,542
Gain recognized on termination of derivatives | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 16,505
Gain (loss) reclassified from other comprehensive income into interest expense | ​ |  | 54 | ​ |  | (10) | ​ |  | 23 | ​ |  | (864)
Designated as Hedging Instrument |
Derivatives, Fair Value [Line Items] |
Fair Value of Derivative Financial Instruments and Classification on Consolidated Statements of Financial Condition | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2022 | ​ | December 31, 2021
​ | ​ | ​ | ​ | Notional | ​ | Fair Value | ​ | Fair Value | ​ | ​ | ​ | Notional | ​ | Fair Value | ​ | Fair Value
(Dollars in thousands) |  | Count |  | Amount |  | Assets |  | Liabilities |  | Count |  | Amount |  | Assets |  | Liabilities
Included in derivative assets/(liabilities): |  |  |  | ​ |  |  | ​ |  |  | ​ |  |  |  |  | ​ |  |  | ​ |  |  | ​ |
Interest rate swaps related to FHLBNY advances |  | 4 | ​ | $ | 150,000 | ​ | $ | 13,497 | ​ | $ | — |  | 4 | ​ | $ | 150,000 | ​ | $ | 4,358 | ​ | $ | —
Not Designated as Hedging Instrument [Member] |
Derivatives, Fair Value [Line Items] |
Fair Value of Derivative Financial Instruments and Classification on Consolidated Statements of Financial Condition | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2022
​ | ​ | ​ | ​ | Notional | ​ | Fair Value | ​ | Fair Value
(In thousands) |  | Count |  | Amount |  | Assets |  | Liabilities
Included in derivative assets/(liabilities): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Loan level interest rate swaps with borrower |  | 10 | ​ | $ | 54,115 | ​ | $ | 882 | ​ | $ | —
Loan level interest rate swaps with borrower |  | 175 | ​ |  | 1,164,869 | ​ |  | — | ​ |  | (84,162)
Loan level interest rate floors with borrower | ​ | 42 | ​ | ​ | 332,806 | ​ | ​ | — | ​ | ​ | (8,376)
Loan level interest rate swaps with third-party counterparties |  | 10 | ​ |  | 54,115 | ​ |  | — | ​ |  | (882)
Loan level interest rate swaps with third-party counterparties | ​ | 175 | ​ | ​ | 1,164,869 | ​ | ​ | 84,162 | ​ | ​ | —
Loan level interest rate floors with third-party counterparties |  | 42 | ​ |  | 332,806 | ​ |  | 8,376 | ​ |  | —
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2021
​ | ​ | ​ | ​ | Notional | ​ | Fair Value | ​ | Fair Value
(In thousands) |  | Count |  | Amount |  | Assets |  | Liabilities
Included in derivative assets/(liabilities): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Loan level interest rate swaps with borrower |  | 98 | ​ | $ | 599,003 | ​ | $ | 27,440 | ​ | $ | —
Loan level interest rate swaps with borrower |  | 87 | ​ |  | 612,610 | ​ |  | — | ​ |  | (12,620)
Loan level interest rate floors with borrower | ​ | 33 | ​ | ​ | 291,990 | ​ | ​ | 615 | ​ | ​ | —
Loan level interest rate floors with borrower | ​ | 12 | ​ | ​ | 100,774 | ​ | ​ | — | ​ | ​ | (53)
Loan level interest rate swaps with third-party counterparties |  | 98 | ​ |  | 599,003 | ​ |  | — | ​ |  | (27,440)
Loan level interest rate swaps with third-party counterparties | ​ | 87 | ​ | ​ | 612,610 | ​ | ​ | 12,620 | ​ | ​ | —
Loan level interest rate floors with third-party counterparties | ​ | 33 | ​ | ​ | 291,990 | ​ | ​ | — | ​ | ​ | (615)
Loan level interest rate floors with third-party counterparties |  | 12 | ​ |  | 100,774 | ​ |  | 53 | ​ |  | —
Loan Level Derivative Income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 30, | ​ | June 30,
(In thousands) |  | 2022 |  | 2021 | ​ | 2022 |  | 2021
Loan level derivative income | ​ | $ | 1,685 | ​ | $ | 559 | ​ | $ | 1,691 | ​ | $ | 2,351

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